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It’s been rumored that American Idol creator Simon Fuller hasn’t had a good relationship with Simon Cowell, but this seems to confirm it, and that the bitterness is as strong as ever.

American Idol creator Simon Fuller is suing Fox and FremantleMedia, alleging that they are refusing to honor an agreement between both parties (which included Simon Cowell,) that would pay and give credit to Fuller on Fox’s latest reality competition series, according to The Hollywood Reporter. The lawsuit claims that Fuller negotiated a deal back in 2004 with Fox after he sued Cowell, alleging that the UK X-Factor was a complete rip-off of Idol. According to the lawsuit, Fox mended the dispute between Fuller and Cowell, and reached an agreement that would give Fuller a royalty and credit for ‘The X-Factor’ if it ever came to the United States. Last year, Fox ordered the US version of The X-Factor, scheduled to premiere in the Fall.

Fuller is now claiming that Fox is not honoring the agreement, and is the reason for the lawsuit. “Mr. Fully has not been hired, nor performed any duties, on the U.S. version of ‘The X Factor,'” said Fox in a statement. “His suit seeks payment and credit as an executive producer despite his neither having been approved by the required parties, nor hired, as such. We believe this lawsuit is without merit and we expect to prevail.”

As of this moment, no injunction has been sought after, so The X-Factor is still on track for a September 21st premiere on Fox.